pH Sensor InPro4260i/SG/225 Back Catalog number: 52005382 Availability: In the manufacturer's stock Price on request - + Recommended MA841 Spare membrane for MW600 (5 pcs). Price on request MA991B/1 Combined glass pH electrode MA991B/1 Price on request MA916B/3 Combined glass pH electrode, refill, BNC, 3m Price on request